Intermittent driving mechanism for moving-picture films.



A. D. S'TANDEFORD.

INTERMITTENT DRIVING MECHANISM FOR MOVING PICTURE FILMS.

APPLICATION FILED DEC-26,1914. 1,132; 1 1.

Patented May 9, 1916.

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ATTORNEY.

man STATES PATENT oFnioE ARCHIE nsraunnroan, or K ivsAs CITY, MISSOURI.

INTERMITTENT DRIVING MECHANISM FOR MOVING-PICTURE FILMS.

To all whom it may concern:

FORD, a citizen of the United States,.rosiding at Kansas City, in the county of Jackson andState of Missouri, have invented certain new and useful Improvements in Intermittent Driving Mechanism for MovingPicture Films, of which the following isa speci fication.

My invention relates toimprov ements in intermittent driving mechanisms for moving picture machines, and one object is to provide a mechanism ofthischaracter to prolong the pausing periods andshorten the moving periods of films, over the present practice, to the end that moving pictures may be displayed with greater distinctness and less flicker than heretofore.

A further object is to provide intermittent. driving mechanism whichwill be free from jars and vibration in its operation, and consequently will not transmit vibration to the film and thus interfere with the proper projection of the pictures upon a screen.

Other objects of the invention will hereinafter appear, and in order that said invention may be fully understood, reference will now be made to the accompanying drawing, in which:

Figure l is a broken elevation of a moving picture'machine provided with my invention. Fig. 2 is a vertical section showing several important featuresof the invention.

Fig. 3 is a vertical section on line IIIIII of Fig. 1. I

Similar reference numerals and letters indicate similar parts throughout the several views. 1

A designates a film which is intermittently driven by the customary sprocket wheel B, fixedly mounted upon a shaft C, journaled in the frame D, havinga shaft E also journaled therein. The shaft E may be driven in the usual manner by either a motor, or a crank F. Fixedly-mounted upon the shaft E is a cog wheel G, which drives a pinion H fixed to alarge cog wheel I, which drives a pinion J, fixedly-mounted upon a shaft K, provided at one end with a fixedly-mounted cog wheel L. The. cog wheel L drives an intermediate cog wheel M, intermeshing with a cog wheel, N, mounted upon a shaft 0, intermediate the shafts C and K. The shaft 0 is provided with a fly-wheel P, which insures steady operation Specification of LettersPatent.

- Application filed December 26, 1914. Serial No. 879,053.

' Patented May 9, 1916.

' of the gear Wheels above described. One Be it known that I, Ancnm D. STANDE- tegral fiat-faced transmission a member 1,

end of the shaft O is provided with an ingins 7 forming the periphery of the star wheel 4. Said cam wheel 6 has a peripheral cavity 8 at one side to successively admit the passage of the points 9 of the star wheel 4, when the same is rotated step by step by a pin 10, projecting laterally from a peripheral flange 11 at one side of the cam wheel 6. The pin 10 successively enters the grooves 5 in the star wheel 4, and rotates the same a distance equal to the distance between the centers of the points 9, each time the pin 10 passes through a groove 5. When the pin 1'0 passes out of a groove the star wheel 4 is held stationary by the periphery of the.

cam wheel 6, engaging the registering concave margin 7 of said star wheel, as disclosed by Fig. 3. The cam wheel 6 is fixedlymounted upon the shaft 3, which latter also carries a fixedly-mounted collar 12, having a peripheral groove 18, to receive a wristpin 14 projecting from a disk 15, mounted upon a shaft 16, journaled in bearings 17, and provided at one end with a bevel wheel 18, driven by a bevel wheel 19, fixedly mounted upon the shaft K. The shaft 16 is provided with a fly-wheel 20, which insures steady operation of said shaft.

In the practical operation of the invention the parts are so geared and timed, in the present instance, that the cam wheel 6 is shifted to the right (Fig. l) at every other revolution, so that its pin 10 will miss the star wheel 4. Hence, instead of said star wheel 4 being turned to move the film A one step at every revolution of the cam wheel 6, as is customary, said star-wheel 4 is turned one step only, on each alternate revolution of thecam wheel 6, thereby insuring longer pausing, or exposure periods of the film. Alternate shifting of the cam wheel 6 to the left and the right is accomplished through the intermediacy of the the latter of which slidingly engages and is driven by the former. The starting and stopping of the longitudinal movements of the shaft 3 will. be attended with little or no shock, because the pin l-t is passing through, substantially, a vertical plane at such times, and consequently the longitudinal speed of the shaft gradually diminishes until it coinesvto a stop.

Vvhile I have shown and described the preferred for-m of my invention, it is obvious that such changes in the arrangement, combination and proportion of parts may be made as properly fall within the spirit and scope of the claim.

Having thus described my invention, what I claim and desire to secure by Letters Patent, 1s:

In combination a sprocket, a gear wheel -to drive said sprocket, a second gear wheel to drive the first gear wheel a shiftable shaft carrying said second gear wheel, means .to shift said shaft to carry the second gear ber, and a fly-wheel mounted upon thelast-.

mentioned shaft to impart steady motion thereto.

In testimony whereof I affix my signature, in the presence of two witnesses.

ARCHIE D. STANDEFOR-D.

WVitnesses F. G. FISCHER, FRED C. FISCHER.

' Copies of this patent may he obtained for five cents each, byeddressing the Commissioner of Patents Washington, D. G. 

